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Could any one suggest me a easy book to learn AT&T syntax of x86 assembly programming so that I can understand the code of xv6 OS better?

Respected Ben. I. had suggested me this free book. But this is a wiki book and at places it shows:

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Since it is a community maintained book? And at places there are prompts of clean up, I guess the book contains everything correct. Because I am a self learner and I do not want to learn anything wrong.

Is there any book easy book written by some author?

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    $\begingroup$ Is there a reason you want.at&t syntax specifically? Every debugger and recompiler I'm aware.of.can generate both (it's a setting/flag) and, in any case, once you learn x86 assembly in one, it's not hard to learn the other syntax. The commands are exactly the same commands, but written out slightly differently. I only ask because I have been led to understand that there are more resources aimed at beginners using intel syntax. $\endgroup$
    – Ben I. ♦
    Commented Mar 6, 2022 at 15:25
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    $\begingroup$ Actually I want to understand the xv6 operating system coding... And the xv6 operating system: iitd.github.io/os/2022/xv6.pdf uses the AT&T syntax. That's the main reason. And the os video lectures of the professor here: iitd.github.io/os/2022 on youtube also explains parts of x86 AT&T syntax. So, I thought of considering the AT&T syntax as it would help me understand it better... $\endgroup$
    – Abhishek Ghosh
    Commented Mar 6, 2022 at 15:33
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    $\begingroup$ Those are pretty solid reasons. The commands are 1 to 1, since they're really the same language, so even after you find a good at&t reference, always know that if an explanation is confusing, you can find the corresponding Intel command and find another explanation of the same command :) $\endgroup$
    – Ben I. ♦
    Commented Mar 6, 2022 at 15:48
  • $\begingroup$ @BenI., I find the intel syntax utterly confusing (after dabbling in 6505, some VAX 11 under BSD and others; yes, weaned on AT&T syntax). $\endgroup$
    – vonbrand
    Commented Mar 9, 2022 at 13:57
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    $\begingroup$ @vonbrand Haha that's amazing! My background is so similar, 6502, but weaned on Intel, and I find at&t basically impossible to read 🤣 But I did use my trick when I got confused a few times and look up the corresponding command in AT&T syntax for a second explanation $\endgroup$
    – Ben I. ♦
    Commented Mar 9, 2022 at 21:09

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Learn to Program with Assembly by Jonathan Bartlett (2021) is a great one.

It teaches assembly programming for x86-64 processors using AT&T syntax and the GNU Assembler. It's a follow up to his 2005 text, Programming from the Ground Up, on the same topic.

I'm trying to learn AT&T syntax assembly as well, and I haven't found an equivalent text published in the last decade.

Good luck

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